Expedition Carts and Associated Methods

ABSTRACT

Exemplary embodiments of an expedition cart are provided. The expedition cart includes a chassis configured and dimensioned to support a load. The expedition cart includes first and second gusset plates attached to the chassis. Each of the first and second gusset plates includes a central body portion and curved fastening edges on either side of the central body portion. The curved fastening edges can be configured and dimensioned to mate against at least a portion of the chassis. Exemplary embodiments of an expedition cart are also provided that include first and second hubs engaged with the chassis, the first and second hubs defining either a single part or a two part design.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part application that claims thebenefit of a co-pending, U.S. Non-Provisional patent application Ser.No. 14/330,929, which was filed on Jul. 14, 2014, which claims thebenefit of U.S. Provisional Patent Application No. 61/845,986, which wasfiled on Jul. 13, 2013. The entire content of the foregoing patentapplications is incorporated herein by reference.

TECHNICAL FIELD

The present invention generally relates to lightweight expedition cartsfor use in carrying supplies over outdoor terrains and, in particular,to expedition carts which are capable of being customized based on usercharacteristics or a user activity, and including components forenhanced load and force distribution, sleeve mounting, and hubreinforcement.

BACKGROUND

Expeditions are a function of distance, load, time, terrain, and packedgear. Regardless of the destination, be it mountaintop or ocean shore,the most grueling aspect of outdoor expeditions is not the distance, butrather the burden carried. Shouldered loads arrest or abort moreexpeditions than blistered toes. One method of carrying loads duringlong distance expedition trips is to pack items in a backpack and wearthe backpack on one's body. However, over time, this can cause physicalinjury to a person's back, hip, legs, or feet.

Thus, a need exists for a means of carrying loads during an expeditionover a variety of terrains which reduce the weight supported by theperson and reduce the risk of injury to the person. These and otherneeds are addressed by the expedition carts and associated systems andmethods of the present disclosure.

SUMMARY

In accordance with embodiments of the present disclosure, exemplaryexpedition carts, e.g., pull carts, are provided that allow a person tocarry heavy loads during an expedition over a variety of terrains orlandscapes for long distances. The expedition carts can be fabricated ofsturdy materials which allow the expedition cart to endure virtually anyterrain encountered throughout extended epics of travel. Use of anexpedition cart to carry expedition equipment and supplies can alleviateor eliminate the problems associated with an expedition. The expeditioncart can be easily and effectively pulled and maneuvered over a varietyof terrains, including rough terrains. In addition, due to thelightweight structure of the expedition cart, the user can disassemble,store and carry the expedition cart when the terrain becomes unsuitablefor use of the expedition cart or pulling the expedition cart becomesimpractical, e.g., during very steep inclines and declines, extremelymuddy terrain, river crossings, and the like. The expedition cart can befabricated from lightweight materials, resulting in a lightweightexpedition cart, yet strong enough to endure rough use. The exemplaryexpedition cart can therefore be easily maneuvered and can bedisassembled and carried by a user when desired.

In accordance with embodiments of the present disclosure, exemplaryexpedition carts are provided that include a chassis configured anddimensioned to support a load. The expedition carts include first andsecond gusset plates secured to the chassis. The expedition cartsfurther include a first sleeve mounted to the first gusset plate and asecond sleeve mounted to the second gusset plate. The first sleeve canbe configured and dimensioned to releasably receive therein at least aportion of a first shaft arm. The second sleeve can be configured anddimensioned to releasably receive therein at least a portion of a secondshaft arm.

In some embodiments, the first and second shaft arms can be telescoping.In such embodiments, each of the first and second shaft arms can includea first tubular member and a second tubular member. The second tubularmember can be configured to translate within the first tubular member.

The chassis can include a pair of substantially horizontal segmentsjoined by a pair of side segments. The chassis can be fabricated from,e.g., a higher quality aluminum tubing, titanium tubing, carbon, and thelike. In some embodiments, one or more sections of the horizontalsegments can be wrapped or can include insulating foam or rubber tubingwhich can cushion the load on the expedition cart, dampen stresses, andadd a frictional coefficient to reduce the hazard of load slippage. Thepair of side segments can be V-shaped. In some embodiments, the pair ofside segments can be outwardly splayed or angled relative to the pair ofhorizontal segments. First and second wheels mounted to the pair of sidesegments can be outwardly splayed relative to the pair of horizontalsegments, thereby providing greater stability to the expedition cart. Itshould be understood that outwardly splayed refers to the wheels beingpositioned closer relative to each other at the top surfaces of thewheels and further apart relative to each other at the bottom orground-contacting surface of the wheels. The first and second wheels canbe mounted to the chassis by two separate and aligned hub bolts. Insplayed wheel embodiments, the hub bolts for the wheels can be angledrelative to each other.

In some embodiments, the first and second sleeves can be fixedly mountedto the first and second gusset plates, respectively. In someembodiments, the first and second sleeves can be pivotally or adjustablymounted to the first and second gusset plates, respectively. Pivotingthe first and second sleeves relative to the first and second gussetplates can vary an angle of inclination of the first and second shaftarms relative to the first and second gusset plates and the chassis. Anadjustment of the angle of inclination of the first and second shaftarms allows customization of the expedition cart to ensure that theloading deck defined by the horizontal segments of the chassis can besubstantially level during trekking on level ground. Each of the firstand second sleeves includes a pivot point and a locking mechanism, e.g.,a spring-loaded pin. The first and second gusset plates can include aplurality of radially spaced holes. Each of the plurality of radiallyspaced holes can be configured and dimensioned to receive the lockingmechanism of the first and second sleeves.

In some embodiments, the first and second shaft arms can include aflattened distal portion. The flattened distal portion can include abore, e.g., a center bore, extending therethrough. The flattened distalportion and the bore of each of the first and second shaft arms can beconfigured to be received by and interlock relative to an interlockingmechanism of a belt or harness worn by a user.

In some embodiments, each of the first and second shaft arms can be atleast partially filled with a dampening material, e.g., a core rod ofplastic, to absorb and dampen impact stresses. Each of the first andsecond shaft arms can include a bracket, e.g., a spring-loaded clip,mounted thereon near a distal end. The bracket can be configured anddimensioned to releasably receive an elongated structure, e.g., awalking stick, therein. The elongated structure can be used to pushand/or pull the expedition cart.

In accordance with embodiments of the present disclosure, exemplaryexpedition cart systems are provided that include an expedition cart asdescribed herein. The systems further include a belt or harness to beworn by a user. The belt or harness can include a pair of interlockingmechanisms which can be configured and dimensioned to releasablyinterlock the flattened portion of the first and second shaft armstherein. Thus, rather than gripping and pulling the expedition cart, theexpedition cart can be pulled through the belt or harness of the user.

In accordance with embodiments of the present disclosure, exemplarymethods of assembling an expedition cart are provided that includeproviding an expedition cart as described herein. The methods includereleasably securing at least a portion of a first shaft arm within thefirst sleeve and releasably securing at least a portion of a secondshaft arm within the second sleeve. In some embodiments, the methodsinclude pivoting the first and second sleeves to vary an angle ofinclination of the first and second shaft arms relative to the first andsecond gusset plates and the chassis. The expedition cart can thereby becustomized based on user characteristics (e.g., height), the type ofactivity for which the expedition cart will be used, user preferences,and the like.

In accordance with embodiments of the present disclosure, an exemplaryexpedition cart is provided that includes a chassis and first and secondgusset plates. The chassis can be configured and dimensioned to supporta load. The first and second gusset plates can be attached to thechassis. Each of the first and second gusset plates can include acentral body portion and curved fastening edges on either side of thecentral body portion. The curved fastening edges can be configured anddimensioned to mate, wrap or snap around at least a portion of thechassis.

The central body portion can define a planar configuration. The curvedfastening edges can extend substantially perpendicularly relative to aplane defined by the central body portion. The curved fastening edgescan include curved inner mating surfaces configured complementary to thechassis. The curved fastening edges mated against (e.g., positionedagainst, wrapped at least partially around, snapped at least partiallyaround, or the like) at least a portion of the chassis distribute forcesimparted on the chassis to the first and second gusset plates along themating surfaces.

In some embodiments, the expedition cart includes a hub secured to avalley portion of the chassis (e.g., the curved transition along theV-shaped or L-shaped side segments of the chassis). In some embodiments,the hub can define a two part design including a first half and a secondhalf configured to be positioned around respective sides of the valleyportion of the chassis. The first and second halves of the hub caninclude a semicircular passage extending between side edges of the firstand second halves. The semicircular passage can be configured anddimensioned to receive respective halves of the valley portion of thechassis. The hub can include a central bore extending perpendicularlyrelative to the semicircular passage, and extending through thesemicircular passage of the first and second halves.

In some embodiments, the hub can define a single part design including abody with two separate passages at opposing sides of the body. The twoseparate passages can be configured and dimensioned to receive endpointsof respective first and second halves of the chassis. The hub caninclude a central bore extending perpendicularly relative to the twoseparate passages without extending through the two separate passages.

In accordance with embodiments of the present disclosure, an exemplaryexpedition cart is provided that includes a chassis and first and secondhubs. The chassis can be configured and dimensioned to support a load.The first and second hubs can be engaged with the chassis. Each of thefirst and second hubs can include a first half and a second halfconfigured to be positioned around respective sides of the chassis.

In some embodiments, the first and second hub can each define a two partdesign. The first and second halves of each of the first and second hubscan include a semicircular passage extending between side edges of thefirst and second halves. The semicircular passage can be configured anddimensioned to receive respective halves of the chassis. Each of thefirst and second hubs can include a central bore extendingperpendicularly relative to the semicircular passage, and extendingthrough the semicircular passage of the first and second halves.

In accordance with embodiments of the present disclosure, an exemplaryexpedition cart is provided that includes a chassis and first and secondhubs. The chassis can be configured and dimensioned to support a load.The first and second hubs can be engaged with the chassis. Each of thefirst hub and the second hub can include a body with two separatepassages at opposing sides of the body. The two separate passages can beconfigured and dimensioned to receive endpoints of respective first andsecond halves of the chassis.

In some embodiments, the hub can define a single part design. Each ofthe first and second hubs can include a central bore extending throughthe hub perpendicularly relative to the two separate passages withoutextending through the two separate passages. In some embodiments, thetwo separate passages can extend at an angle greater than zero degreesrelative to horizontal.

Other objects and features will become apparent from the followingdetailed description considered in conjunction with the accompanyingdrawings. It is to be understood, however, that the drawings aredesigned as an illustration only and not as a definition of the limitsof the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

To assist those of skill in the art in making and using the disclosedexpedition carts and associated systems and methods, reference is madeto the accompanying figures, wherein:

FIG. 1 is a perspective, front view of an exemplary expedition cartaccording to the present disclosure;

FIG. 2 is a front view of the exemplary expedition cart of FIG. 1;

FIG. 3 is a detailed, side view of the exemplary expedition cart of FIG.1;

FIG. 4 is a side view of the exemplary expedition cart of FIG. 1;

FIG. 5 is a perspective, front view of a chassis of the exemplaryexpedition cart of FIG. 1;

FIG. 6 is a perspective, side view of the exemplary expedition cart ofFIG. 1;

FIG. 7 is a detailed, side view of a handle of the exemplary expeditioncart of FIG. 1;

FIG. 8 is a detailed, side view of a handle of the exemplary expeditioncart of FIG. 1;

FIG. 9 is a perspective view of an exemplary harness configured toreleasably receive a handle of the exemplary expedition cart of FIG. 1;

FIG. 10 is a perspective view of an exemplary expedition cart includingtelescoping handles according to the present disclosure;

FIG. 11 is a perspective view of an exemplary expedition cart accordingto the present disclosure;

FIG. 12 is a detailed, side view of an exemplary gusset plate and sleeveaccording to the present disclosure;

FIG. 13 is a detailed, side view of an exemplary gusset plate andadjustable sleeve according to the present disclosure;

FIG. 14 is a detailed, front view of an exemplary chassis according tothe present disclosure;

FIG. 15 is a detailed, front view of an exemplary chassis according tothe present disclosure;

FIG. 16 is a detailed, front view of an exemplary hub according to thepresent disclosure;

FIG. 17 is a detailed, top view of an exemplary hub of FIG. 16;

FIG. 18 is a detailed, front view of an exemplary hub according to thepresent disclosure;

FIG. 19 is a detailed, top view of an exemplary hub of FIG. 18;

FIG. 20 is a perspective view of an exemplary gusset plate according tothe present disclosure;

FIG. 21 is a perspective view of an exemplary gusset plate according tothe present disclosure; and

FIG. 22 is a perspective view of an exemplary assembly of a hub, gussetplate and chassis according to the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

With reference to FIGS. 1-8, an exemplary expedition cart 100 isprovided that includes a chassis 102, e.g., a frame body, for supportinga load to be carried on the expedition cart 100. The chassis 102includes a pair of substantially horizontal segments 104, 106 joinedtogether by a pair of side segments 108, 110. In some embodiments, oneor both of the horizontal segments 104, 106 can include a bend along thelength of the horizontal segments 104, 106. For example, one or both ofthe horizontal segments 104, 106 can include a bend at a substantiallycentral portion to form a groove into which a load to be carried can bepositioned. The bend or curve in the horizontal segments 104, 106 canassist in maintaining a load positioned on the chassis 102 in thedesired position. In some embodiments, the horizontal segments 104, 106can be substantially linear and the load can be maintained on thechassis 102 by implementing attachment means, e.g., pack straps, rope,bungee cables, combinations thereof, and the like.

The side segments 108, 110 can be V-shaped or L-shaped, the endpoints ofwhich join the horizontal segments 104, 106. The side segments 108, 110thereby create a separation between the horizontal segments 104, 106which defines the loading deck onto which a load can be positioned. Inparticular, the horizontal segments 104, 106 act as spreaders whichdefine the width of the expedition cart 100 and represent the entiretyof the gear storage surface of the expedition cart 100. For example, abackpack can be positioned on the horizontal segments 104, 106 such thatthe horizontal segments 104, 106 support the backpack thereon. In someembodiments, one or both of the horizontal segments 104, 106 can includeone or more support elements 111, e.g., foam tubing wrapped around thehorizontal segments 104, 106, a rubber coating, and the like. In someembodiments, the support elements 111 can be in the form of a texturedsurface. The support elements 111 can provide a cushion for the loadpositioned on the chassis 102, can dampen stresses on the chassis 102,and add a frictional coefficient to reduce the hazard of load slippage.

In some embodiments, the chassis 102 can be fabricated from a highquality aluminum tubing which is bent into the desired shape. In someembodiments, the chassis 102 can be fabricated from a molded carbonfiber, titanium or equivalently strong and lightweight material. Forexample, titanium can provide the desired rigidity of the chassis 102and the desired strength to support a heavy load during an expedition.However, it should be understood that alternative materials can beimplemented as long as the materials are capable of withstanding loadsand stresses associated with transporting supplied in a variety ofterrains. For example, materials can be selected based on the type ofactivity the expedition cart 100 will be implemented for. As an example,an expedition cart 100 to be used in mountain trekking which willrequire lifting of the expedition cart 100 to cross rivers can befabricated from lighter materials than an expedition cart 100 to be usedfor transporting items to a beach. Although illustrated as substantiallytubular in cross-section, in some embodiments, the chassis 102 candefine a square cross-section.

The expedition cart 100 includes a pair of gusset plates 112, 114attached to the respective side segments 108, 110. The gusset plates112, 114 can provide a mounting surface for additional components of theexpedition cart 100 and can act to unify and reinforce the chassis 102.In some embodiments, the gusset plates 112, 114 can be patterned and cutfrom squares of, for example, ¼ inch aluminum flat sheets. However,alternative lightweight materials, e.g., titanium, carbon, and the like,can also be implemented. Although illustrated as substantially circularin shape, in some embodiments, the gusset plates 112, 114 can define,e.g., rectangular, trapezoidal, triangular shapes, and the like.

The gusset plates 112, 114 can be attached to the side segments 108, 110of the chassis 102 by, e.g., welding or through-bolts for each sidesegment 108, 110, combinations thereof, and the like. However,alternative connection techniques can be used as viable alternative tomount the gusset plates 112, 114 to the chassis 102. When the expeditioncart 100 moves under a load, the gusset plates 112, 114 can distributeforces through the chassis 102, thereby reducing localized stress andeccentric moment events. The gusset plates 112, 114 can provide enhancedload and force distribution, sleeve mounting surfaces, and hubreinforcement. It should be understood that alternative configurationsor designs of the gusset plates 112, 114 can be used, e.g., smallergusset plates 112, 114. In particular, as long as structural integritiesare maintained, smaller gusset plates 112, 114 generally relates to alighter expedition cart 100. In some embodiments, the gusset plates 112,114 can include one or more openings that function as handholds and/orlashing points (see, e.g., FIG. 22). For example, the opening(s) canfunction as a handhold to allow the user to grip the gusset plate 112,114 when handling the expedition cart 100. As a further example, theopening(s) can function as lashing points for passage of straps tosecure a load on the chassis 102.

Wheels 116, 118 can be mounted to the chassis 102 at each respectiveside segment 108, 110. The wheels 116, 118 can be mounted to the sidesegments 108, 110 with wheel hubs or hub bolts 120. In some embodiments,the nadir of the V-shape or L-shape of the side segments 108, 110 can beflattened such that the side segments 108, 110 can mate relative to awheel hub. In some embodiments, the nadir of the side segments 108, 110can remain substantially round in cross-section and a pivot hole can bedrilled through the side segments 108, 110 and the gusset plates 112,114 to receive a hub bolt 120, e.g., an axle. The wheels 116, 118 can besecured to the hub bolt 120 with a locking nut 122. In some embodiments,the wheels 116, 118 can each include a race and bearing assembly suchthat the wheels 116, 118 rotate via the race and bearing assembly whilethe hub bolts 120 remain fixed relative to the gusset plates 112, 114.

In some embodiments, as shown in FIG. 1, the expedition cart 100 caninclude one or more electric generator assemblies 121. In someembodiments, the electric generator assembly 121 can be mechanicallycoupled to a hub or gusset plate 112, 114 of the expedition cart 100. Insome embodiments, the electric generator assembly 121 can be infrictional contact with the wheel(s) 116, 118 of the expedition cart100. In some embodiments, the electric generator assembly 121 can bemounted to a gusset plate 112, 114. In some embodiments, the electricgenerator assembly 121 can be mounted to a hub. Each electric generatorassembly 121 can include, e.g., an electrical generator (such as adynamo) and an electrical energy storage (such as a battery). Theelectric generator assembly 121 can be used to convert themechanical/rotational motion of the wheel(s) 116, 118 into electricalenergy to be stored in the electrical energy storage. The electricgenerator assembly 121 can include an output source that can connectwith a charging cable for a variety of electronic devices, allowing auser to charge electrical equipment (e.g., a mobile device, or the like)from the generated electrical energy.

Although illustrated as substantially perpendicular to the horizontalsegments 104, 106, in some embodiments, the side segments 108, 110 canbe gradually angled or splayed relative to the horizontal segments 104,106. For example, the side segments 108, 110 can be positioned closerrelative to each other at the points of contact with the horizontalsegments 104, 106 and can be angled outwardly by, e.g., approximatelythree degrees, approximately five degrees, approximately seven degrees,and the like, such that the side segments 108, 110 are positionedfurther apart relative to each other at the nadir of the side segments108, 110. The angled or splayed side segments 108, 110 can result inangled or splayed mounting of the wheels 116, 118 relative to thechassis 102. The angled or splayed wheels 116, 118 can provideadditional stability for the expedition cart 100 and reduce or preventinstances of the chassis 102 flipping over when the wheels 116, 118 passover obstacles.

In some embodiments, the wheels 116, 118 can include spokes 116, 118. Insome embodiments, the wheels 116, 118 can be spokeless and can includesolid tires which are positioned outside of the chassis 102. The hubbolts 120 on which the wheels 116, 118 are mounted can be of a quickrelease type. The wheels 116, 118 can rotate relative to the hub lots120 via a race and bearing assembly associated with the wheels 116, 118.The hub bolts 120 can extend through the gusset plate 112, 114, thechassis 102 and the wheel 116, 118. By providing wheels 116, 118 onseparate hub bolts 120 (rather than on a single wheel axle), the groundclearance of the expedition cart 100 can be raised substantially abovethe height of the axis of rotation of the wheels 116, 118.

For example, in some embodiments, the wheels 116, 118 define a diameterof approximately twenty-four inches and an axis of rotation at a heightfrom the ground of approximately twelve inches. However, the loadcarried on the loading deck defined by the horizontal segments 104, 106of the chassis 102 can be at a height of approximately nineteen inches,providing the expedition cart 100 with additional ground clearance ofapproximately seven inches as compared to a cart having a single centralwheel axle. The expedition cart 100 can thereby avoid becoming caught ona greater number of ground obstacles, such as small bushes, rocks,branches, and the like. It should be understood that the dimensions ofthe expedition cart 100 discussed herein, including the width of thehorizontal segments 104, 106 and the size of the wheels 116, 118, can bevaried while still falling within the intended scope of the invention.For example, in some embodiments, when the expedition cart 100 isdisassembled and strapped to a backpack worn by a user, the twenty-fourinch wheels 116, 118 can provide sufficient clearance of the backpack,while being positioned adjacent to the back of the user. Although thewheels 116, 118 can be dimensioned to be greater than twenty-fourinches, a greater height of the wheels 116, 118 can increase the heightof the chassis 102, thereby resulting in risk of less stability of thechassis 102. In such embodiments, stability of the chassis 102 can beincreased by, e.g., increasing the splay of the wheels 116, 118 relativeto the chassis 102, increasing the width between the wheels 116, 118,combinations thereof, and the like.

The expedition cart 100 further includes a pair of shaft-arm or handlesleeves 124, 126. The sleeves 124, 126 can be fabricated from, e.g.,aluminum, carbon, titanium, and the like. The sleeves 124, 126 can bemounted to the gusset plates 112, 114 by welding. For example, thesleeves 124, 126 can be welded to the gusset plates 112, 114 at an angledesigned to maintain a level loading deck defined by the horizontalsegments 104, 106 while traveling on level ground.

In some embodiments, the sleeves 124, 126 can be pivotally positionedrelative to the gusset plates 112, 114 such that the angle ofinclination of the sleeves 124, 126 relative to the loading deck of thechassis 102 can be adjusted or customized based on user characteristics,e.g., height, the type of activity the expedition cart 100 is to be usedfor, and user preferences. For example, the sleeves 124, 126 can beflexibly connected to the gusset plates 112, 114 by center pinning andcan include a spring-loaded pin configured to be received in graduatedholes formed in the gusset plates 112, 114. In some embodiments, thegusset plates 112, 114 can include a viewable protractor adjacent to thegraduated holes to indicate to a user the different angles ofinclination relative to the loading deck. The sleeves 124, 126 canthereby be adjusted at the point-of-sale based on user characteristics,user activities, or both, or can be adjusted in the field based on, forexample, varying slopes of travel.

The sleeves 124, 126 can be mounted substantially parallel relative toeach other. The cross-sectional configuration of the sleeves 124, 126can be, e.g., square, circular, and the like, and can be configured anddimensioned to receive a respective shaft arm 128, 130, e.g., handle,therein. In some embodiments, the sleeves 124, 126 can define two openends. In some embodiments, the sleeves 124, 126 can define only one openend configured to receive a portion of the shaft arm 128, 130 and theclosed opposing end can assist in retaining the shaft arm 128, 130secured within the sleeve 124, 126.

As discussed above, the expedition cart 100 includes a pair of shaftarms 128, 130 which define a proximal end 132 and a distal end 134. Theshaft arms 128, 130 can be detachably secured to and can extend from therespective sleeves 124, 126. In particular, the proximal end 132 of theshaft arms 128, 130 can be secured to the chassis 102 at the sleeves124, 126, and the distal end 134 of the shaft arms 128, 130 can begripped by a user, secured to a belt or harness of a user, or both. Theshaft arms 128, 130 length can be calculated to satisfy load overhang,leg stride, waist height, combinations thereof, and the like. Althoughillustrated as fixed in length, in some embodiments, the shaft arms 128,130 can be, e.g., customized by user characteristics, customized by useractivity, telescoping to allow field adjustments or customization basedon varying topographic contours and user characteristics (see, forexample, FIG. 10).

The shaft arms 128, 130 can be galvanically compatible, rustproofed,gasketed, primed and/or painted and can be axially reliable. In someembodiments, the shaft arms 128, 130 can be circular in cross-section.In some embodiments, the shaft arms 128, 130 can define a squarecross-section. The shaft arms 128, 130 can be fabricated from, e.g.,aluminum, titanium, carbon, steel, and the like. In some embodiments,the shaft arms 128, 130 can be filled with a dampening material, e.g., acore rod of acrylonitrile butadiene styrene (ABS) plastic, to absorb anddampen impact stresses. In some embodiments, the shaft arms 128, 130 caninclude caps 136 on the bottom portion of the proximal end 132 toprevent intrusion of dirt and debris.

In some embodiments, after being inserted into the sleeves 124, 126, theproximal end 132 of the shaft arms 128, 130 can be releasably secured inthe sleeves 124, 126 by respective clevis pins 138. For example, thesleeves 124, 126 can include guide holes passing through the width ofthe sleeves 124, 126 and the shaft arms 128, 130 near the proximal end132 can include a complementary guide hole passing through the width ofthe shaft arms 128, 130. The guide holes can be configured anddimensioned to receive a quick release wire lock clevis pin 138. Thus,when the proximal ends 132 of the shaft arms 128, 130 are inserted intothe respective sleeves 124, 126, clevis pins 138 can be used toreleasably lock the shaft arms 128, 130 within the sleeves 124, 126. Insome embodiments, two clevis pins 138 can be used for each shaft arm128, 130 to ensure a rigid connection between the sleeves 124, 126 andshaft arms 128, 130.

In some embodiments, the distal end 134 of the shaft arms 128, 130 caninclude a gripping structure thereon, e.g., a textured surface, a foamcover, a rubber cover, and the like, to provide an area at which theuser can grip the shaft arms 128, 130 for pulling the expedition cart100. With reference to FIG. 7, in some embodiments, a portion of thedistal end 134 of the shaft arms 128, 130 can be flattened into ahorizontal or vertical paddle 140. For example, a portion of the shaftarms 128, 130 can be peened flat into the flattened paddle 140configuration. Each of the paddles 140 can include a center boring 142passing therethrough. The paddle 140 and the boring 142 can beconfigured and dimensioned to releasably interlock relative to a waistbelt or torso/shoulder harness worn by a user (see, for example, FIG.9). As will be discussed in greater detail below, the flattened paddle140 can be positioned between two separated flanges includingcomplementary center bores and, for example, respective quick releasewire lock clevis pins can be used to secure the shaft arms 128, 130relative to the belt or harness of a user. Thus, rather than grippingand pulling the expedition cart 100, the expedition cart 100 can besecured to the belt or harness of a user and the user can maintain freehands for alternative purposes.

The exemplary expedition cart 100 discussed herein can also beimplemented for pushing a load. In particular, with reference to FIG. 8,each of the arm shafts 128, 130 can include a cross bar bracket 144secured thereon. The brackets 144 can be secured to a top surface of thearm shafts 128, 130, e.g., a surface facing away from the ground. Insome embodiments, the brackets 144 can be secured to a bottom surface ofthe arm shafts 128, 130, e.g., a surface facing the ground. The brackets144 can be in the form of a spring clip. A first end 146 of the brackets144 facing away from the distal end 134 of the arm shafts 128, 130 canbe fixedly secured (e.g., welded) to the arm shafts 128, 130 and anopposing second end 148 facing the user can be configured to lift up tocreate an opening 150. In some embodiments, the first end 146 caninclude a hinge at which the bracket 144 can pivot. In some embodiments,the first end 146 can be substantially continuous and the spring forcewithin the bracket 144 can allow flexing of the bracket 144. As anexample, the second end 148 of each bracket 144 can be lifted to createan opening 150 for passage of an elongated structure 152, e.g., awalking stick, a cross bar, and the like. Upon insertion of theelongated structure 152 under the bracket 144, the bracket 144 canspring back to an unopened positioned and can retain the elongatedstructure 152 within a substantially complementary region 154 formedbetween the shaft arms 128, 130 and the bracket 144. A push bar canthereby be formed for pushing the expedition cart 100.

In some embodiments, the elongated structure 152 can also be used topull the expedition cart 100. In particular, the spring force within thebrackets 144 can be sufficiently high to maintain the elongatedstructure 152 within the region 154 during pulling of the expeditioncart 100. In some embodiments, a locking mechanism can be implementedfor releasably locking the elongated structure 152 within the region154.

As discussed above, and with reference to FIG. 9, an exemplary harness200, e.g., a belt, is provided for releasably interlocking with theexpedition cart 100. Although illustrated as worn around the waist of aperson, it should be understood that alternative configurations ofharnesses can be used with the interlocking mechanisms discussed herein.In particular, the harness 200 includes two interlocking mechanisms 202horizontally spaced relative to each other. Each of the interlockingmechanisms 202 includes a pair of spaced flanges 204 with a hole passingtherethrough. The interlocking mechanisms 202 further include a clevispin 206, e.g., a wire lock clevis pin 206, configured and dimensioned topass through the holes of the flanges 204 and releasably interlockrelative to the flanges 204. A user can thereby insert the respectiveflattened paddle 140 portions of the shaft arms 128, 130 in the spaceformed between the flanges 204 and the clevis pins 206 can be passedthrough the holes in the flanges 204 and the boring 142 of the flattenedpaddles 140 to interlock the shaft arms 128, 130 relative to the harness200. Thus, rather than pulling the expedition cart 100 by gripping theshaft arms 128, 130, the user can pull the expedition cart 100 with theharness 200 while maintaining their hands free for alternative purposes.

With reference to FIG. 10, an alternative expedition cart 300 isprovided. In particular, the expedition cart 300 can be substantiallysimilar in structure and function to the expedition cart 100 discussedabove, except for the distinctions noted herein. Therefore, similarstructures are marked with similar reference numbers.

The expedition cart 300 includes telescoping shaft arms 302, 304. Inparticular, each shaft arm 302, 304 includes a first shaft arm 306 and asecond shaft arm 308, e.g., first and second tubular members, whichtranslate relative to each other. For example, the second shaft arm 308can translate within the first shaft arm 306 to allow the length of theshaft arms 302, 304 to be adjusted or customized based on, e.g., usercharacteristics, user activities, user preferences, and the like.

One or more clevis pins 310, e.g., wire lock clevis pins, can beimplemented for detachably interlocking the first and second shaft arms306, 308 relative to each other. For example, the first shaft arm 306can include a hole passing therethrough configured and dimensioned toreceive the clevis pin 310 therethrough. Similarly, the second shaft arm308 can include a plurality of spaced holes 311 along the length of thesecond shaft arm 308 for alignment with the hole of the first shaft arm306 and receipt of the clevis pin 310. Thus, the first shaft arms 306can be inserted into and interlocked relative to the sleeves 124, 126,and the length of the shaft arms 302, 304 can be adjusted for userpreferences by translating the second shaft arm 308 within the firstshaft arm 306. In some embodiments, the first shaft arm 306, the secondshaft arm 308, or both, can be filled with a dampening material 312,314, e.g., a core rod of ABS plastic or a similar material, to absorband dampen impact stresses.

With reference to FIG. 11, an alternative expedition cart 400 isprovided. In particular, the expedition cart 400 can be substantiallysimilar in structure and function to the expedition carts 100, 300discussed above, except for the distinctions noted herein. Therefore,similar structures are marked with similar reference numbers.

The expedition cart 400 includes a chassis 402 including substantiallylinear horizontal segments 404, 406. Thus, rather than defining a bendor curve in the horizontal segments 104, 106, the horizontal segments404, 406 extend linearly between the side segments 108, 110. Inaddition, the gusset plates 408, 410 of the expedition cart 400 can besubstantially trapezoidal in configuration. The trapezoidalconfiguration allows contact points on both sides of the gusset plates408, 410 against the side segments 108, 110 and provides sufficientsurface area for mounting the sleeves 124, 126. However, the trapezoidalconfiguration reduces the amount of material for fabrication, therebyreducing the weight of the expedition cart 400.

With reference to FIG. 12, in some embodiments, the sleeves 124, 126 canbe fixedly bolted to the gusset plates 408, 410 based on an angle of thesleeves 124, 126 relative to the loading deck determined duringfabrication. For example, the sleeves 124, 126 can be bolted to thegusset plates 408, 410 with two bolts 409 (e.g., recessed bolts). Theshaft arms 302, 304 therefore extend from the chassis 402 at a fixedangle. If an adjustment of the orientation of the chassis 402 isdesired, the telescoping shaft arms 302, 304 can be implemented toregulate the length of the shaft arms 302, 304 which, in turn, affectthe orientation of the chassis 402.

With reference to FIG. 13, in some embodiments, the sleeves 124, 126 canbe pivotally secured to the gusset plates 408, 410. In particular, thesleeves 124, 126 can be mounted such that an angle of the sleeves 124,126 relative to the loading deck can be adjusted or customized by theuser to vary the angle at which the shaft arms 302, 304 extend from thechassis 402. For example, the sleeves 124, 126 can include respectivepivot points 416, e.g., a recessed axle, rotatably connecting thesleeves 124, 126 to the gusset plates 408, 410. The sleeves 124, 126 canrotate about the pivot points 416 to adjust the angle of inclination ofthe sleeves 124, 126. Adjustment of the angle of inclination of thesleeves 124, 126 can ensure that the loading deck of the chassis 402 ispositioned substantially level to the ground (e.g., to horizontal)during transport on level ground. In particular, based on the angleadjustment, the chassis 402 can be positioned substantially parallel tothe ground at all slopes.

Each of the sleeves 124, 126 can include a spring-loaded pin 418, e.g.,a locking mechanism, protruding therefrom at a position spaced from thepivot point 416. The spring-loaded pin 418 can be configured anddimensioned to snap into a complementary hole 420 formed in the gussetplates 408, 410. In particular, the gusset plates 408, 410 can include aplurality of holes 420 radially spaced to allow the sleeves 124, 126 tobe interlocked at a variety of angles of inclination. In someembodiments, the angle of inclination of the sleeves 124, 126 can bevaried within a range of, e.g., approximately fifteen degrees, eighteendegrees, twenty degrees, and the like. To release and rotate the sleeves124, 126, the spring-loaded pin 418 can be depressed by a user. In someembodiments, the gusset plates 408, 410 can include markings or anglesadjacent to the respective holes 420 to indicate to a user the angle ofthe sleeve 124, 126 relative to the loading deck of the chassis 402.Although illustrated as spring-loaded pins 418, it should be understoodthat alternative interlocking mechanisms, e.g., a ratcheting mechanism,can be used to releasably secure the sleeves 124, 126 relative to thegusset plates 408, 410.

With reference to FIG. 14, in some embodiments, the side segments 108,110 of the chassis 402 can be angled or splayed relative to thehorizontal segments 104, 106. In particular, the side segments 108, 110can be angled outward at approximately five degrees such that the sidesegments 108, 110 are positioned further apart relative to each other atthe nadir than at the connecting portions at the horizontal segments104, 106. The wheels 116, 118 can thereby be mounted to the sidesegments 108, 110 in an angled or splayed manner to provide greaterstability to the expedition cart 400.

With reference to FIG. 15, in some embodiments, the side segments 108,110 of the chassis 402 can be substantially perpendicular relative tothe horizontal segments 104, 106. In particular, the side segments 108,110 can be substantially parallel relative to each other. The wheels116, 118 can thereby be mounted to the side segments 108, 110 andrelative to each other in a parallel manner.

As noted above, the hub bolt 120 provides mounting of the wheels 116,118 to the chassis 102 and a race and bearing assembly of the respectivewheels 116, 118 allows the wheels 116, 118 to rotate relative to the hubbolt 120. The hub bolt 120 can pass through the respective portions ofthe chassis 102 and the respective gusset plate 112, 114 for mounting ofthe wheels 116, 118 to the chassis 102. In such embodiments, a borepasses through the wheels 116, 118, the chassis 102 and the gussetplates 112, 114 for passage of the hub bolt 120 therethrough. As theexpedition cart 100, 400 passes over terrain, stress on the hub bolt 120results in stresses imparted on the bore in the chassis 102 and thegusset plates 112, 114, which can deform the bore over time.

In some embodiments, the expedition cart 100, 400 can include a hubsecured relative to the chassis 102 to provide additional support tostress imparted on the hub bolt 120. In particular, the hub providesstructural support to the hub bolt 120, thereby preventing the boreformed in the chassis 102 and the gusset plates 112, 114 from warpingover time. FIGS. 16 and 17 show front and top views of an exemplary hub500 according to the present disclosure. The hub 500 generally includesa two part design including a first half 502 and a second half 504. Aswill be discussed in greater detail below, the first and second halves502, 504 are configured and dimensioned to fit around a valley portion421 of the chassis 102, 402 (see, e.g., FIGS. 12 and 13).

The first and second halves 502, 504 can be substantially symmetricaland fit together to form the hub 500. The first and second halves 502,504 each include an outer edge 506 defining a convex surface and aninner edge 508 defining a concave surface. The radius of curvature ofthe outer edge 506 can be dimensioned smaller than the radius ofcurvature of the inner edge 508. Thus, the hub 500 can define asubstantially U-shaped configuration. In some embodiments, the hub 500can define a square or rectangular configuration. The outer and inneredges 506, 508 are joined by substantially flat side edges 510, 512.

Each of the first and second halves 502, 504 includes a curved,semicircular passage 514, 516 formed therein and passing therethrough.In particular, the semicircular passages 514, 516 are configured suchthat when the first and second halves 502, 504 are positioned adjacentto each other, the semicircular passages 514, 516 form a substantiallycurved, circular passage 518 passing through the hub 500 between theside edges 510, 512. Initially, the passage 518 extends in a directionperpendicular to the respective side edge 510, 512, and curves towards amiddle portion of the hub 500 to define a substantially U-shaped orarced configuration. Thus, the openings leading to the passage 518 ateach of the side edges 510, 512 extend at an angle 520 (e.g., betweenapproximately 20 degrees and approximately 50 degrees) relative tohorizontal 522. It should be understood that the curvature and size ofthe passage 518 can be complementary to the curvature and configurationof the valley portion 421 of the chassis 102, 402 such that the opposinghalves 502, 504 can be positioned around and secured to the valleyportion 421 with minimal clearance between the chassis 102, 402 and theinner surface of the passage 518 (e.g., the passage 518 receives thevalley portion 421 of the chassis 102, 402).

The hub 500 includes a central bore 524 extending perpendicular to theextension of the passage 518. In particular, the central bore 524extends through the first and second halves 502, 504 and through thepassage 518. The central bore 524 can be configured and dimensioned toreceive therethrough the hub bolt 120 (or a similar fixation element).The hub 500 includes three or more fixation bores 526 formed therein andextending through the first and second halves 502, 504. Rather thanextending through the passage 518, the fixation bores 526 can extend ina direction perpendicular to the passage 518 and be disposed aboveand/or below the passage 518. In some embodiments, one fixation bore 526can be disposed above the passage 518 and aligned with the central bore524, and two fixation bores 526, 526 can be disposed below the passage518 and radially offset from the central bore 524. In some embodiments,rather than extending through the hub 500, the fixation bores 526 canextend a partial distance of the width of the hub 500 and can be tappedto receive a fixation element.

The hub 500 can be used with a chassis 102, 402 that defines asingle-piece construction (e.g., the chassis defines a continuouslyformed frame that extends between the wheels 116, 118 and furtherdefines a continuous valley portion 421). In particular, duringassembly, the first and second halves 502, 504 can be positioned aroundthe chassis 102, 402 (e.g., wrapped or mated around the valley portion421) such that the valley portion 421 is received within the passage518. The preformed curvature of the passage 518 allows for a bore of thechassis 102, 402 to align with the central bore 524 when the first andsecond halves 502, 504 are disposed around the chassis 102, 402.

Fixation elements 528 (e.g., bolts) can be passed through the fixationbores 526 to secure the first and second halves 502, 504 relative toeach other. In some embodiments, the fixation elements 528 can be usedto detachably secure the hub 500 to the respective gusset plate 112,114. The hub bolt 120 can be passed through the respective wheel 116,118, the central bore 524, the bore of the chassis 102, 402, and a borein the respective gusset plate 112, 114 to secure the wheel 116, 118 tothe hub 500, chassis 102, 402, and gusset plate 112, 114. In someembodiments, spacers can be disposed between the chassis 102, 402 andthe gusset plate 112, 114. Thus, rather than the bores in the chassis102, 402 and the gusset plate 112, 114 supporting the stresses on thewheels 116, 118 during rotation, the hub 500 provides structural supportand stability to the hub bolt 120. In particular, the hub 500distributes the load from the hub bolt 120 to the entire curved matingsurface along the passage 518 to prevent warping of the bores in thechassis 102, 402 and gusset plates 112, 114. Therefore, the hub 500distributes the load from point contact stresses at the hub bolt 120 tosurface contact stress along the surfaces of the passage 518 that matewith the chassis 102, 402.

In some embodiments, rather than including a chassis 102, 402 having asingle-piece construction, a two-piece construction can be used to allowfor more compact storage of the expedition cart 100, 400 in thecollapsed configuration. For example, the chassis 102, 402 can be formedby two halves 423, 425 separated at the valley portion 421 (see, e.g.,FIGS. 12 and 13). Thus, rather than including a continuous valleyportion 421, the two halves 423, 425 can be separated from each otherand define endpoints of each of the halves 423, 425.

FIGS. 18 and 19 show front and top views of an exemplary hub 550configured and dimensioned to be used with a chassis 102, 402 having atwo-piece construction (or a multi-piece construction). The structureand function of the hub 550 can be substantially similar to that of thehub 500, except for the distinctions noted herein. Therefore, likereference numbers are used to represent like structures. The hub 550 canbe in the form of a single part design. In particular, rather thanincluding two halves that fit over the valley portion 421 of the chassis102, 402, the hub 550 can be configured and dimensioned as a singlecomponent that receives the end portions of each of the chassis halves423, 425.

Rather than including two halves with a passage 518 formed by twosemicircular passages 514, 516, the hub 550 includes a solid bodystructure with two passages 552, 554 extending into the hub 550 onopposing sides of the hub 550. In particular, the first passage 552extends substantially perpendicularly to the side wall 510 in thedirection of a central bore 524, thereby being at an angle 520 (e.g.,between approximately 20 degrees and approximately 50 degrees) relativeto horizontal 522. The second passage 554 extends substantiallyperpendicularly to the opposing side wall 512 in the direction of thecentral bore 524, thereby being at an angle 520 relative to horizontal522. The first and second passages 552, 554 do not connect within thebody of the hub 550 and instead remain separated. The hub 550 defines asubstantially symmetrical structure along a central vertical axispassing through the central bore 524. The central bore 524 extendsthrough the hub 550 without passing through the first and secondpassages 552, 554.

Although not shown, in some embodiments, the hub 550 can includefastening bores 526 and fasteners 528 for mounting the hub 550 to therespective gusset plate 112, 114. In some embodiments, the hub 550 caninclude bores extending perpendicularly through the first and secondpassages 552, 554 configured to receive fasteners to secure the firstand second halves 423, 425 of the chassis 102, 402 relative to the hub550. Thus, rather than the openings in the chassis 102, 402 and thegusset plate 112, 114 supporting the weight and stress on the wheels116, 118 during rotation, the hub 550 provides structural support andstability to the hub bolt 120. In particular, the hub 550 distributesthe load from the hub bolt 120 to prevent warping of the openings in thechassis 102, 402 and gusset plates 112, 114. Therefore, the hub 550distributes the load from point contact stresses at the hub bolt 120 tosurface contact stress along the surfaces of the passages 552, 554 thatmate with the endpoints of the chassis halves 423, 425.

As shown in FIGS. 1 and 11, in some embodiments, the gusset plates 112,114 can define substantially planar structures configured to be mountedto the chassis 102, 402 with fasteners 139 (e.g., bolts) at two or morepoints. In such embodiments, although the gusset plates 112, 114distribute the forces imparted on the chassis 102, 402 to reduce theoverall point forces on the chassis 102, 402, the forces may remainfocused on the contact points at which the fasteners 139 pass throughthe gusset plates 112, 114.

FIGS. 20 and 21 show perspective views of exemplary gusset plates 600,650 that are configured and dimensioned to distribute forces imparted onthe chassis 102, 402 during use of the expedition cart 100, 400. Thegusset plates 600, 650 can be substantially similar in structure andfunction, except for the distinctions noted herein. It should beunderstood that the sleeves 124, 126 and/or shaft arms 128, 130 can bemounted to the gusset plates 600, 650 in a substantially similar mannerto that described above. Therefore, like reference numbers are used forlike structures. The gusset plate 600, 650 includes a central bodyportion 602 that defines a substantially planar configuration (e.g., aflat, plate defining a thin configuration having a thicknesssubstantially smaller in dimension that the width and height of theplate). In some embodiments, the central body portion 602 includes a topedge 604 (e.g., an outer edge) that defines a convex curvature, and abottom edge 606 (e.g., an inner edge) that defines a concave curvature.Thus, the central body portion 602 can define a substantially U-shapedconfiguration. The curvature of the central body portion 602 provides aminimum fender between the load and the wheels 116, 118, providesopenings for securing the load to the chassis 102, and provides openingsfor lifting the expedition cart 100 (e.g., handholds).

The concave curvature of the bottom edge 606 forms a cutout 608 definedby the bottom edge 606. In some embodiments, as shown in FIG. 20, thecutout 608 can be dimensioned such that a central distance 610 betweenthe top and bottom edges 604, 606 is dimensioned greater than a sideedge distance 612 between the top and bottom edges 604, 606 (e.g., theradius of curvature of the bottom edge 606 is greater than the radius ofcurvature of the top edge 604). In some embodiments, as shown in FIG.21, the cutout 608 can be dimensioned such that the central distance 610between the top and bottom edges 604, 606 is dimensioned smaller thanthe side edge distance 612 between the top and bottom edges 604, 606(e.g., the radius of curvature of the bottom edge 606 is smaller thanthe radius of curvature of the top edge 604). In some embodiments, thedimensions of the distances 610, 612 can be selected based on areduction in material to be used for fabrication of the gusset plate600, 650. For example, the gusset plate 650 is formed from substantiallyless material than the gusset plate 600, allowing for a reduction inoverall weight of the gusset plate 650 and the expedition cart 100, 400.

The central body portion 602 includes side edges 614, 616 that connectthe top and bottom edges 604, 606. Each of the side edges 614, 616includes a curved fastening edge 618, 620 either formed as an extensionof the central body portion 602 or secured to the respective side edges614, 616. The curved fastening edges 618, 620 extend the length of theside edges 614, 616 (e.g., the side edge distance 612) and curve in adirection substantially perpendicular to a plane defined by the centralbody portion 602. Thus, the planar endpoint 622, 624 of each of thecurved fastening edges 618, 620 extends in a direction perpendicular tothe extension of the central body portion 602. In addition, due to thecurvature of the central body portion 602, the curved fastening edges618, 620 extend at an angle 634 (e.g., between approximately 70 degreesand approximately 100 degrees, e.g., approximately 90 degrees, or thelike) relative to each other. The angle 634 can be substantiallycomplementary to the angled configuration defined by the V-shaped orL-shaped side segments 108, 110 of the chassis 102. Each curvedfastening edge 618, 620 includes a curved inner mating surface 626, 628configured and dimensioned complementary to the chassis 102, 402 (e.g.,the rounded surface of the chassis 102, 402). Each curved fastening edge618, 620 includes an outer surface 630, 632 that defines a rounded edge.

FIG. 22 shows a perspective view of an assembly including the chassis102, the hub 500, and the gusset plate 650. It should be understood thatthe assembly could include a variety of hub and/or gusset plateconfigurations, such as hub 550 and/or the gusset plate 600. Asdiscussed above, the first and second halves 502, 504 of the hub 500 aredisposed or mated around the valley portion 421 of the chassis 102, andthe fasteners 528 are used to secure the hub 500 around the valleyportion 421 of the chassis 102. The gusset plate 650 can be assembledrelative to the chassis 102 by mating the curved fastening edges 618,620 against the respective portions of the chassis 102 and positioningthe ends of the curved fastening edges 618, 620 against the side edges510, 512 of the first and second halves 502, 504 of the hub 500. In someembodiments, mating the curved fastening edges 618, 620 against thechassis 102 can be in the form of, e.g., positioning the curvedfastening edges 618, 620 against the chassis 102, wrapping the curvedfastening edges 618, 620 at least partially around the respectiveportions of the chassis 102, snapping the curved fastening edges 618,620 at least partially around the respective portions of the chassis102, or the like.

Mating of the curved fastening edges 618, 620 against the respectiveportions of the chassis 102 positions the curved inner mating surfaces626, 628 against the chassis 102 such that continuous contact betweenthe chassis 102 and the inner mating surfaces 626, 628 is formed. Suchcontact ensures that force applied on the chassis 102 is distributed tothe gusset plate 650 along the inner mating surfaces 626, 628 (e.g.,contact surface stress distribution versus point contact stress). Insome embodiments, fasteners (e.g., bolts) can be used to secure thegusset plate 650 to the chassis 102. In some embodiments, due to thecurvature of the curved fastening edges 618, 620, the gusset plate 650can be maintained in the mating position relative to the chassis 102without the use of fasteners. Due to the curvature of the curvedfastening edges 618, 620 around at least a portion of the respectiveextensions of the chassis 102, the curved fastening edges 618, 620reduce or prevent flexing of the chassis 102 sides away from each otherwhen a load is applied on the chassis 102. Thus, the gusset plate 650provides overall structural support to the chassis 102 during use of theexpedition cart 100.

In some embodiments, the gusset plate 650 (or any of the gusset platesdiscussed herein) can include one or more openings 652, 654, 656 formedtherein that can function as handholds and/or lashing points. Forexample, the opening 652 can define an elongated structure (e.g.,approximately four inches or greater) including a linear bottom edge 658and a rounded top edge 660. The configuration of the opening 652provides a handhold for handling the expedition cart (e.g., lifting theexpedition cart, or the like). In some embodiments, the intersection ofthe linear bottom edge 658 and the rounded top edge 660 can be, rounded,angled, or the like.

The openings 654, 656 can function as lashing points. For example,straps can be passed through the openings 654, 656 for securing a loadon the chassis 102. In some embodiments, the orientation of the openings654, 656 can be symmetrical on either side of the opening 652. In someembodiments, the orientation of the openings 654, 656 can beasymmetrical relative to the opening 652 (e.g., at different angles) soas not to interfere with the sleeve (not shown) for the shaft armmounted on the gusset plate 650. In the asymmetrical configuration, itshould be understood that the gusset plates 650 on opposing sides of thechassis 102 have mirror images of the openings 654, 656 due to thediffering orientation of the sleeves and shaft arms.

The expedition carts discussed herein can substantially reduce theamount of load supported by a user. In particular, the expedition cartsreduce the amount of pull force to the horizontal component of theweight of the load, plus the friction component due to the wheels. As anexample, the expedition cart can be expected to pull an approximately100 lb load over most surfaces with less than approximately 20 lbs ofpull force. The substantial reduction in support allows the user totravel through a variety of terrains while simultaneously transporting alarge amount of supplies.

The expedition carts discussed herein can be fabricated fromlightweight, yet rigid, materials, thereby resulting in expedition cartswhich are extremely light and transportable. If a user encountersseverely sloped ascents and descents, is required to carry theexpedition cart across a river or over muddy conditions, or desires totransport the expedition cart when it is not in use, the expedition cartcan be efficiently disassembled for transport within a short timeperiod. For example, the shaft arms can be separated from the respectivesleeves by removing the clevis pins and the shaft arms can be pulled outof the sleeves. If telescoping shaft arms are implemented, the shaftarms can be collapsed into a configuration of minimum length. Theremaining assembly of the expedition cart can be carried by hand ormounted/strapped to a pack for transport. As discussed above, the wheelscan be dimensioned such that when the expedition cart is strapped to apack, there is sufficient clearance for the pack and the wheels arepositioned adjacent to the back of a user. In particular, theimplementation of separate hub bolts (rather than a single axle) allowsthe wheels to fit around the sides of the pack in a more compact andcomfortable carrying position.

While exemplary embodiments have been described herein, it is expresslynoted that these embodiments should not be construed as limiting, butrather that additions and modifications to what is expressly describedherein also are included within the scope of the invention. Moreover, itis to be understood that the features of the various embodimentsdescribed herein are not mutually exclusive and can exist in variouscombinations and permutations, even if such combinations or permutationsare not made express herein, without departing from the spirit and scopeof the invention.

1. An expedition cart, comprising: a chassis configured and dimensionedto support a load, and a first gusset plate and a second gusset plateattached to the chassis, wherein each of the first and second gussetplates includes a central body portion and curved fastening edges oneither side of the central body portion, the curved fastening edgesbeing configured and dimensioned to mate against at least a portion ofthe chassis.
 2. The expedition cart according to claim 1, wherein thecentral body portion defines a planar configuration.
 3. The expeditioncart according to claim 1, wherein the curved fastening edges extendperpendicularly relative to a plane defined by the central body portion.4. The expedition cart according to claim 1, wherein the curvedfastening edges include curved inner mating surfaces configuredcomplementary to the chassis.
 5. The expedition cart according to claim1, wherein the curved fastening edges are configured and dimensioned tosnap around at least a portion of the chassis, and wherein snappingaround at least a portion of the chassis distributes forces imparted onthe chassis to the first and second gusset plates.
 6. The expeditioncart according to claim 1, comprising a hub secured to a valley portionof the chassis.
 7. The expedition cart according to claim 6, wherein thehub defines a two part design including a first half and a second halfconfigured to be positioned around respective sides of the valleyportion of the chassis.
 8. The expedition cart according to claim 7,wherein the first and second halves of the hub include a semicircularpassage extending between side edges of the first and second halves, thesemicircular passage being configured and dimensioned to receiverespective halves of the valley portion of the chassis.
 9. Theexpedition cart according to claim 8, comprising a central boreextending perpendicularly relative to the semicircular passage, andextending through the semicircular passage of the first and secondhalves.
 10. The expedition cart according to claim 6, wherein the hubdefines a single part design including a body with two separate passagesat opposing sides of the body.
 11. The expedition cart according toclaim 10, wherein the two separate passages are configured anddimensioned to receive endpoints of respective first and second halvesof the chassis.
 12. The expedition cart according to claim 6, comprisinga central bore extending perpendicularly relative to the two separatepassages without extending through the two separate passages.
 13. Anexpedition cart, comprising: a chassis configured and dimensioned tosupport a load, and a first hub and a second hub engaged with thechassis, wherein each of the first and second hubs includes a first halfand a second half configured to be positioned around respective sides ofthe chassis.
 14. The expedition cart according to claim 13, wherein thefirst and second hub each define a two part design.
 15. The expeditioncart according to claim 13, wherein the first and second halves of eachof the first and second hubs include a semicircular passage extendingbetween side edges of the first and second halves, the semicircularpassage being configured and dimensioned to receive respective halves ofthe chassis.
 16. The expedition cart according to claim 15, wherein eachof the first and second hubs include a central bore extendingperpendicularly relative to the semicircular passage, and extendingthrough the semicircular passage of the first and second halves.
 17. Anexpedition cart, comprising: a chassis configured and dimensioned tosupport a load, and a first hub and a second hub engaged with thechassis, wherein each of the first hub and the second hub includes abody with two separate passages at opposing sides of the body, the twoseparate passages being configured and dimensioned to receive endpointsof respective first and second halves of the chassis.
 18. The expeditioncart according to claim 17, wherein the hub defines a single partdesign.
 19. The expedition cart according to claim 17, wherein each ofthe first and second hubs include a central bore extending through thehub perpendicularly relative to the two separate passages withoutextending through the two separate passages.
 20. The expedition cartaccording to claim 17, wherein the two separate passages extend at anangle greater than zero degrees relative to horizontal.